Lubricating oil compositions having improved sludge dispersancy

ABSTRACT

MINERAL LUBRICATING OIL COMPOSITIONS ARE PREPARED CONTAINING OIL-SOLUBLE ADDITIVES HAVING IMPROVED SLUDGE INHIBITION AND DISPERSION, ANTIWEAR ACTIVITY, AND ANTIOXIDANT PROPERTIES UNDER HIGH TEMPERATURE CONDITIONS. THE NOVEL ADDITIVES ARE PREPARED BY REACTING, AT BETWEEN ABOUT 215* AND ABOUT 255*C., ELEMENTAL SULFUR WITH OIL-SOLUBLE HYDROCARBONS CONTAINING ALIPHATIC RADICALS AND REACTING THE SULFURIZED PRODUCT WITH PRIMARY, SECONDARY, OR TERTIARY MONO, DI OR POLY ALIPHATIC AMINES OR AMINO ALCOHOLS. SLUDGE DISPERSING AMOUNTS OF THE ADDITIVES ARE EMPLOYED IN THE OIL COMPOSITIONS AND USUALLY RANGE BETWEEN ABOUT 0.05 AND ABOUT 10.0 WT. PRECENT OF THE TOTAL COMPOSITION. THEY ARE PARTICULARLY USEFUL IN LUBRICATING OIL WHICH ALSO CONTAINS AN ANTIWEAR AGENT, I.E., THE ZINC SALT OF A DIALKYL DITHIOPHOSPAHTE.



